16668573 has 4 divisors (see below), whose sum is σ = 22224768. Its totient is φ = 11112380.

The previous prime is 16668569. The next prime is 16668647. The reversal of 16668573 is 37586661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16668573 - 2² = 16668569 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2778093 + ... + 2778098.

It is an arithmetic number, because the mean of its divisors is an integer number (5556192).

Almost surely, 2^16668573 is an apocalyptic number.

It is an amenable number.

16668573 is a deficient number, since it is larger than the sum of its proper divisors (5556195).

16668573 is an equidigital number, since it uses as much as digits as its factorization.

16668573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556194.

The product of its digits is 181440, while the sum is 42.

The square root of 16668573 is about 4082.7163751600. The cubic root of 16668573 is about 255.4462160347.

The spelling of 16668573 in words is "sixteen million, six hundred sixty-eight thousand, five hundred seventy-three".